Dimensional Design on the Six-Cable Driven Parallel Manipulator of FAST

2011 ◽  
Vol 133 (11) ◽  
Author(s):  
Xiaoqiang Tang ◽  
Rui Yao
Keyword(s):  
Radio Telescope ◽  
Parallel Manipulator ◽  
Optimization Design ◽  
Design Method ◽  
Guizhou Province ◽  
Large Span ◽  
Similarity Model ◽  
Dimensional Parameters ◽  
Set Up ◽  
Design Result

China is now building the world’s largest single dish radio telescope in Guizhou province, which is called Five-hundred meter Aperture Spherical radio Telescope (FAST). The main purpose of this paper is to present an effective dimensional design method on the six-cable driven parallel manipulator of FAST. Sensitivity design method is adopted for the six-cable driven parallel manipulator of FAST. Cable has the capability to bear tension but not compression, so that cable driven parallel manipulator may not be controlled as expected if tension of one cable is small or zero. Therefore, for dimensional design of the six-cable driven parallel manipulator, three functions to evaluate tension performance were proposed. The tension performance functions can reflect the uniformity of cable tension and controllability of the six-cable driven parallel manipulator. According to the sensitivity design method and tension performance evaluating functions, a set of optimized dimensional parameters is calculated for constructing the six-cable driven parallel manipulator of FAST. In order to verify the optimization design result, a similarity model of the six-cable driven parallel manipulator was set up in Beijing. A serial of experiments shows that tension performance of the six-cable driven parallel manipulator satisfies the system’s requirement. More importantly, it provides a theoretical reference for further study on dimensional design of a cable driven parallel manipulator with large span.

Dimension Optimization Design of the Stewart Platform in FAST

2011 ◽  
Vol 308-310 ◽  
pp. 2110-2113 ◽  
Author(s):  
Rui Yao ◽  
Wen Bai Zhu ◽  
Qing Ge Yang
Keyword(s):  
Radio Telescope ◽  
Optimization Design ◽  
Design Method ◽  
Stewart Platform ◽  
Design Flow ◽  
Guizhou Province ◽  
Objective Functions ◽  
The World ◽  
Adjustable Mechanism ◽  
Feed Support System

China is now building the largest single dish radio telescope in the world in Guizhou province, which is called Five-hundred meter Aperture Spherical radio Telescope (FAST). A Stewart platform is introduced in FAST as an accuracy adjustable mechanism for feed receivers. The main purpose of this paper is to discuss dimension optimization design method of the Stewart platform based on three optimization objective functions. The optimization objective functions can reflect the operability and accuracy of the Stewart platform, and optimization design flow is presented according to the important degree of the three optimization objectives. Finally, a set of optimized parameters is obtained, and the study in this paper provides a basis for the coming optimization the feed support system for FAST in the next step.

Study on Optimization Design of a Hoist Roller

2011 ◽  
Vol 415-417 ◽  
pp. 460-463
Author(s):  
Li Liu ◽  
Hong Xia Liu
Keyword(s):  
Optimization Design ◽  
Design Method ◽  
Plate Thickness ◽  
Optimization Method ◽  
Practical Significance ◽  
Application Software ◽  
Side Plate ◽  
Design Variables ◽  
Programming Software ◽  
Set Up

In the design of wrapping hoist, the roller strength is always a larger problem. In this paper, diameter, wall thickness and side plate thickness of the roller were selected as design variables, and volume of the roller acts as object function. Through analyzing its inner stresses, the mechanical model and mathematical model were set up. Adopting the optimization method of covering complex and VB programming software, an application software of a hoist roller optimization design was got. An example is used to verify correctness and practicability of the software. This optimization design method has practical significance on reducing the weight and material of a hoist roller.

The Design of Emergency Rescue Equipment for Agricultural Motor-Pumped Wells

2014 ◽  
Vol 488-489 ◽  
pp. 1104-1107
Author(s):  
Kai Bao Wang ◽  
Wen Kai Ma ◽  
Xian Ge Meng ◽  
Rui Feng Wang ◽  
Xing Fu Wang
Keyword(s):  
Mechanical System ◽  
Optimization Design ◽  
Simulation Analysis ◽  
Design Method ◽  
Dynamics Analysis ◽  
Small Space ◽  
Emergency Rescue ◽  
Combined Action ◽  
Set Up ◽  
Negotiation Mechanism

A wide variety of motor-pumped wells were used in agricultural in our daily life. Considering the service situation, the motor-pumped well was exposed to the air usually. With the condition, the falling accidents of underage children are reported frequently. It is extremely complicated to rescue the children trapped in the narrow and small space. The emergency rescue equipment based on optimization design method and dynamics analysis is introduced in the paper. This Motor-pumped well Rescue Equipment with the carrying platform can be controlled by the flexible rope to adapt to different rescue site. With the protection of umbrella support structure, the equipment completes combined action by dragging the manipulator; the equipment has been set up scalable obstacle negotiation mechanism so that it can adapt to the Motor-pumped well larger than 350 mm in diameter. In the research, the virtual prototype technology was used to simulate the kinematics and dynamics characteristics of the mechanical system. The feasibility of the design scheme of mechanical system was proved with the simulation analysis results. The equipment has advantages of the structure is compact, safe and reliable, easy to use. The research of the emergency rescue equipment for agricultural motor-pumped wells can be regarded as the reference of the related research.

scholarly journals Dynamic Optimization Research on the Section Morphology of Large-span Tunnels in Shallow Rock Mass

2015 ◽  
Vol 9 (1) ◽  
pp. 210-213 ◽  
Author(s):  
Wang Hui ◽  
Wang Qing-biao
Keyword(s):  
Optimization Design ◽  
Ground Surface ◽  
Calculation Model ◽  
Dynamic Calculation ◽  
Optimization Analysis ◽  
Large Span ◽  
Ground Surface Settlement ◽  
Set Up ◽  
Engineering Stability ◽  
Excavation Area

The optimization design of the section morphology of large-span tunnels plays an important role for saving cost and improving the engineering stability. The flat ratio of tunnel which is as an important control index, its rationality is the key problem in the design of tunnels. Program with Python to set up the dynamic calculation model of a large-span tunnel planned to be constructed which can be run and analyzed in ABAQUS. The MATLAB language is used to compile the optimization analysis program based on genetic algorithm, and then the dynamic calculation model is embedded into it. Using excavation area, plastic zone, ground surface settlement, vault subsidence, etc. as optimal objective to make dynamic analysis for the model and put forward the reasonable flat ratio of the supported project. The result of this paper provides reference for the section optimization design of similar tunnel engineering.

Genetic-Fuzzy Optimal Design of Straw Crusher Based on Full-Feeding Combine Harvesters

2010 ◽  
Vol 152-153 ◽  
pp. 778-781
Author(s):  
Li Qing Chen ◽  
Jia Qi Zhang ◽  
Ji Xian Wang
Keyword(s):  
Optimization Design ◽  
Design Method ◽  
Internal Diameter ◽  
Math Model ◽  
Feeding Type ◽  
Design Of Agricultural Machinery ◽  
Set Up ◽  
Combine Harvesters ◽  
Working Device ◽  
Fuzzy Genetic

In recent years, with the full-feeding type of the straw chopping device combines the development has been widespread concern and research. The paper designed a straw crusher device and fuzzy genetic optimization design. Firstly, straw crusher device math model was build; secondly, The cutter shaft in the working device axis diameter, internal diameter was set variables; thirdly, combined with the GA and fuzzy optimum design method, straw crusher optimization design model was set up with straw crusher working device quality of the lightest for the objective function. Lastly, Optimization obtained satisfactory operating parameters, and provides a reference in the design of agricultural machinery.

Multi-Target Optimization Design of Earthquake-Resistant Structure Taking Ductility and Cost into Account

2010 ◽  
Vol 163-167 ◽  
pp. 2415-2419 ◽  
Author(s):  
Hong Sheng Zhao ◽  
Hui Ji
Keyword(s):  
Reinforced Concrete ◽  
Structural Design ◽  
Optimization Design ◽  
Design Method ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Earthquake Resistant ◽  
Reinforced Concrete Frame Structure ◽  
Design Result

Using the conventional structural design methods, the design result is usually not the most economical and the most reasonable. While, using the single target structural optimization design method, duo to the only one target function to be optimized, the design result often can not meet with the multiple requirements of structural designing, furthermore its optimizing efficiency is low. So its application is limited. This paper proposes multi-target earthquake-resistant optimization design method for reinforced concrete frame structure under earthquake loading. In the optimization design approach, the ductility and cost which are two factors contradictory each other in structure designing are simultaneously taken as the target functions, and the function relation formula between them has been established, giving simultaneous consideration to the structural economy, safety and practicability. Using this design approach, the optimum cross-sectional dimensions, with the largest ductility and the lowest cost, of the reinforced concrete frame structure which is optimized under earthquake loading, can be obtained by computer. The practical examples of structure design, which have been optimized by using this approach, show that the cost of construction has been cut down by about 10% comparing with the conventional designing. The optimization process presented in this paper conforms entirely to the China national standards: “Code for Design of Reinforced Concrete Structures” (GB50010-2002) and “Code for Earthquake-resistant Design of Buildings” (GB50011). The theory and methods presented in this paper, having not only their theory meanings but their practical values, will be helpful for the structural design engineers and the researchers.

Simulation Analysis and Optimization Design of Double-Wishbone Independent Suspension

2014 ◽  
Vol 541-542 ◽  
pp. 519-523 ◽  
Author(s):  
Xi Ting Wang ◽  
Yi Feng Zhao ◽  
Bin Jiao
Keyword(s):  
Optimal Design ◽  
Optimization Design ◽  
Simulation Analysis ◽  
Design Method ◽  
Design Parameters ◽  
Original Design ◽  
Development Environment ◽  
Kinematics Simulation ◽  
Wheel Alignment ◽  
Set Up

The parameter modeling for the front double-wishbone independent suspension of a vehicle is set up in the development environment of ADAMS, and then, the kinematics simulation analysis for original design parameters are processed. The contribution of design parameters to the sensitivity of the double-wishbone independent suspension is analyzed and the influence of design parameters on the performance of the suspension such as the wheel alignment parameters is investigated. The optimal design for the suspension is carried on by using the experiment design method, which not only realizes the requirement for good wheel alignment parameters, but also improves the sideways displacement of wheel obviously.

Optimal kinematic design of a three translational DoFs parallel manipulator

Robotica ◽  
2005 ◽  
Vol 24 (2) ◽  
pp. 239-250 ◽  
Author(s):  
Xin-Jun Liu
Keyword(s):  
Parallel Manipulator ◽  
Design Space ◽  
Design Method ◽  
Performance Criteria ◽  
Stiffness Index ◽  
Design Parameters ◽  
Kinematic Design ◽  
Normalized Parameters ◽  
The Relationship ◽  
Design Result

In this paper, an optimal kinematic design method of a three translational DoFs parallel manipulator is presented. The design is based on the concept of performance chart, which can show the relationship between a criterion and design parameters graphically and globally. The normalization on the design parameters of the studied manipulator makes it possible that the design space, which is made up of the normalized parameters, is limited. The design space includes of all possible basic similarity manipulators (BSMs). As any one of the BSMs represents all of its similarity manipulators (SMs) in terms of performances, if one BSM is optimal, its SMs are optimized as well. The said optimal BSM is from the optimum region, which is the intersecting result of involved performance charts. In this paper, the related performance criteria are good-conditioning workspace (GCW), global conditioning index (GCI) and global stiffness index (GSI). As an applying example, a design result of the parallel manipulator with a desired task workspace is presented. The results of the paper are very useful for the design and application of a parallel manipulator.

Efficient Optimization Design Method Using Kriging Model

2005 ◽  
Vol 42 (5) ◽  
pp. 1375-1375 ◽  
Author(s):  
Shinkyu Jeong ◽  
Mitsuhiro Murayama ◽  
Kazuomi Yamamoto
Keyword(s):  
Optimization Design ◽  
Design Method ◽  
Kriging Model

Optimum Design for the Frame of Open Type Abrasive Flow Polish Machine

2012 ◽  
Vol 497 ◽  
pp. 89-93
Author(s):  
Liang Liang Yuan ◽  
Ke Hua Zhang ◽  
Li Min
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Finite Element Methods ◽  
Optimization Design ◽  
Low Cost ◽  
Three Dimensional ◽  
Force Model ◽  
Optimization Analysis ◽  
Open Type ◽  
Set Up

In order to process heterotype hole of workpiece precisely, an open abrasive flow polish machine is designed, and the optimization design of machine frame is done for low cost. Firstly, basing on the parameters designed with traditional ways, three-dimensional force model is set up with the soft of SolidWorks. Secondly, the statics and modal analysis for machine body have been done in Finite element methods (FEM), and then the optimization analysis of machine frame has been done. At last, the model of rebuild machine frame has been built. Result shows that the deformation angle value of machine frame increased from 0.72′ to 1.001′, the natural frequency of the machine decreased from 75.549 Hz to 62.262 Hz, the weight of machine decreased by 74.178 Kg after optimization. It meets the strength, stiffness and angel stiffness requirement of machine, reduces the weight and cost of machine.

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